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Measurements of branching fractions and CP-violating charge asymmetries in charmless $B$ decays reconstructed in 2019--2020 Belle~II data
F. Abudinén, I. Adachi, R. Adak, K. Adamczyk, P. Ahlburg, J. K. Ahn, H. Aihara, Н. Акопов, A. Aloisio, F. Ameli, L. Andricek, N. Anh Ky, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, V. Aushev, T. Aziz, S. Bacher, S. Baehr, S. Bahinipati, A. M. Bakich, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, G. Batignani, J. Baudot, A. Beaulieu, Jürgen Becker, P. K. Behera, M. Bender, J. V. Bennett, E. Bernieri, F. U. Bernlochner, M. Bertemes, M. Bessner, S. Bettarini, V. Bhardwaj, F. Bianchi, T. Bilka, S. Bilokin, D. Biswas, A. Bobrov, A. Bondar, G. Bonvicini, A. Bożek, M. Bračko, P. Branchini, N. Braun, R. A. Briere, T. E. Browder, D. N. Brown, A. Budano, L. Burmistrov, S. Bussino, M. Campajola, L. Cao, G. Caria, G. Casarosa, C. Cecchi, D. Červenkov, M.-C. Chang, P. Chang, V. Chekelian, C. Chen, Y.-C. Chen, Y.Q. Chen, Y.-T. Chen, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, S. Choudhury, D. Cinabro, L. Corona, L. Cremaldi, D. Cuesta, S. Cunliffe, T. Czank, N. Dash, F. Dattola, E. De La Cruz–Burelo, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, B. Deschamps, M. Destefanis, S. Dey, A. De Yta-Hernandez, A. Di Canto, F. Di Capua, S. Di Carlo, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, K. Dort, D. Dossett, S. Dubey, S. Duell, G. Dujany, S. Eidelman, M. Eliachevitch, D. Epifanov, J. Fast, T. Ferber, D. Ferlewicz, G. Finocchiaro, S. Fiore, P. Fischer, A. Fodor, F. Forti, A. Frey, M. Friedl, M. Gabriel, N. Gabyshev, E. Ganiev, M. Garcia-Hernandez, R. B. Garg, A. Garmash, V. Gaur, A. Gaz, U. Gebauer, Michael H. Gelb, A. Gellrich, J. Gemmler, Thomas Geßler, D. Getzkow, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, P. Goldenzweig, B. Golob, P. Gomis, P. Grace, W. Gradl, E. Graziani, D. Greenwald, Y. Guan, C. Hadjivasiliou, S. Halder, K. Hara, T. Hara, O. Hartbrich, T. Hauth, K. Hayasaka, H. Hayashii, C. Hearty, M. Heck, M. T. Hedges, I. Heredia-De La Cruz, M. Hernández Villanueva, A. D. Hershenhorn, T. Higuchi, E. Hill, H. Hirata, M. Hoek, M. Hohmann, S. E. Hollitt, T. Hotta, C.-L. Hsu, K. Huang, T. Iijima, K. Inami, G. Inguglia, J. Irakkathil Jabbar, A. Ishikawa, M. Iwasaki, Y. Iwasaki, P. Jackson, W. W. Jacobs, I. Jaeglé, D. E. Jaffe, E.-J. Jang, M. Jeandron, H. B. Jeon, S. Jia, Y. Jin, C. Joo, K. K. Joo, І. Каденко, J. Kahn, H. Kakuno, A. B. Kaliyar, J. Kandra, K. H. Kang, P. Kapusta, Robert Karl, G. Karyan, Yuji Katō, H. Kawai, T. Kawasaki, Thomas M. Keck, C. Ketter, H. Kichimi, C. Kiesling, B.H. Kim, C.-H. Kim, D.Y. Kim, H.J. Kim, J.B. Kim, K.-H. Kim, K. Kim, S.-H. Kim, Y.-K. Kim, Y. Kim, T.D. Kimmel, H. Kindo, K. Kinoshita, C. Kleinwort, B. Knysh, T. Koga, S. Kohani, I. Komarov, T. Konno, S. Korpar, N. Kovalchuk, T. M. G. Kraetzschmar, P. Križan, R. Kroeger, J. F. Krohn, P. Krokovny, H. Krüger, W. Kuehn, T. Kuhr, J. Kumar, M. Kumar, R. Kumar, K. Kumara, T. Kumita, T. Kunigo, M. Künzel, S. Kurz, A. Kuzmin, P. Kvasnička, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, C. La Licata, K. Lalwani, L. Lanceri, J. S. Lange, K. Lautenbach, P. Laycock, F. R. Le Diberder, I.-S. Lee, S.C. Lee, P. Leitl, D. Levit, P. Lewis, C. Li, C.-H. Li, L.K. Li, S.X. Li, Y.M. Li, Y.B. Li, J. Libby, K. Lieret, L. Li Gioi, J. Lin, Z. Liptak, Q.Y. Liu, Z.A. Liu, D. Liventsev, S. Longo, A. Loos, P.-C. Lu, M. Lubej, T. Lueck, F. Luetticke, T. Luo, C. MacQueen, Y. Maeda, M. Maggiora, S. Maity, R. Manfredi, E. Manoni, S. Marcello, C. Mariñas, A. Martini, M. Masuda, T. Matsuda, K. Matsuoka, D. Matvienko, J. McNeil, F. Meggendorfer, J. C. Mei, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, K. Azmi, G. B. Mohanty, H. K. Moon, T. Moon, J. A. Mora Grimaldo, A. Morda, T. Morii, H. G. Moser, M. Mrvar, F. Mueller, F. Müller, Th. Müller, G. Muroyama, C. Murphy, R. Mussa, K. Nakagiri, I. Nakamura, K. R. Nakamura, E. Nakano, M. Nakao, Hiroyuki Nakayama, H. Nakazawa, T. Nanut, Z. Natkaniec, A. Natochii, M. Nayak, D. Neverov, C. Niebuhr, M. Niiyama, J. Ninković, N. K. Nisar, S. Nishida, K. Nishimura, M. Nishimura, M. H. A. Nouxman, B. Oberhof, K. Ogawa, S. Ogawa, S. L. Olsen, Y. Onishchuk, H. Ono, Y. Onuki, P. Oskin, E. R. Oxford, H. Ozaki, P. Pakhlov, G. Pakhlova, A. Paladino, T. Pang, A. Panta, E. Paoloni, S. Pardi, C. Park, H. Park, S.-H. Park, B. Paschen, A. Passeri, A. Pathak, S. Patra, S. Paul, T. K. Pedlar, I. M. Peruzzi, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, P. L. M. Podesta-Lerma, G. Polat, V. Popov, C. Praz, E. Prencipe, M. T. Prim, M. V. Purohit, N. Rad, P. Rados, S. Raiz, R. Rasheed, M. Reif, S. Reiter, M. Remnev, P. K. Resmi, I. Ripp-Baudot, M. Ritter, M. Ritzert, G. Rizzo, L. B. Rizzuto, S. H. Robertson, D. Rodríguez Pérez, J. M. Roney, C. Rosenfeld, A. Rostomyan, N. Rout, M. Różańska, G. Russo, D. Sahoo, Y. Sakai, D. A. Sanders, S. Sandilya, A. Sangal, L. Šantelj, J. Sasaki, V. Savinov, B. Scavino, H. Schreeck, J. Schueler, C. Schwanda, A. J. Schwartz, B. Schwenker, R. M. Seddon, Y. Seino, A. Selce, K. Senyo, I.S. Seong, J. Serrano, M. E. Sevior, C. Sfienti, V. Shebalin, C. P. Shen, H. Shibuya, J.-G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, S. Skambraks, K. Smith, R. Sobie, A. Soffer, Y. Soloviev, E. Solovieva, S. Spataro, B. Spruck, M. Starič, S. Stefkova, Z. S. Stottler, R. Stroili, J. Strube, J. Stypula, M. Sumihama, K. Sumisawa, T. Sumiyoshi, D. J. Summers, W. Sutcliffe, K. Suzuki, S.Y. Suzuki, H. Svidras, M. Tabata, M. Takahashi, M. Takizawa, U. Tamponi, S. Tanaka, K. Tanida, H. Tanigawa, N. Taniguchi, Y. Tao, P. Taras, F. Tenchini, D. Tonelli, E. Torassa, K. Trabelsi, T. Tsuboyama, N. Tsuzuki, M. Uchida, I. Ueda, S. Uehara, T. Ueno, T. Uglov, K. Unger, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Yu. A. Usov, S. Vahsen, R. van Tonder, G. S. Varner, K. E. Varvell, A. Vinokurova, L. Vitale, V. Vorobyev, A. Vossen, B. Wach, E. Waheed, H. M. Wakeling, Kun Wan, W. Wan Abdullah, B. Wang, C.H. Wang, M.-Z. Wang, X.L. Wang, A. Warburton, M. Watanabe, S. Watanuki, I. J. Watson, J. C. Webb, S. Wehle, M. Welsch, C. Wessel, J. Wiechczynski, P. Wieduwilt, H. Windel, E. Won, X. P. Xu, B. Yabsley, S. Yamada, W. B. Yan, S. B. Yang, H. Ye, J. Yelton, In‐Sung Yeo, J. H. Yin, M. Yonenaga, Y. Yook, T. Yoshinobu, C. Z. Yuan, Gao Yuan, W.Y. Yuan, Y. Yusa, L. Zani, J.Z. Zhang, Y. Zhang, Z. Zhang, V. Zhilich, Q. Zhou, V. Zhukova, V. Zhulanov, A. Zupanc
Bibliographic record
VenuearXiv (Cornell University) · 2020
Typepreprint
Languageen
FieldPhysics and Astronomy
TopicParticle physics theoretical and experimental studies
Canadian institutionsnot available
FundersInstitut National de Physique Nucléaire et de Physique des ParticulesJapan Society for the Promotion of ScienceNatural Sciences and Engineering Research Council of CanadaKorea Research Environment Open NetworkCentro de Investigación y de Estudios Avanzados del Instituto Politécnico NacionalIstituto Nazionale di Fisica NucleareNational Institute of InformaticsMinistry of Science and Higher Education of the Russian FederationBundesministerium für Bildung, Wissenschaft und ForschungMinistry of Education and Science of UkraineAkademi Sains MalaysiaMinistry of Science and Technology, IsraelJavna Agencija za Raziskovalno Dejavnost RSNational Foundation for Science and Technology DevelopmentMax-Planck-GesellschaftMinistry of Education, Culture, Sports, Science and TechnologyKorea Institute of Science and Technology InformationLiaoning Revitalization Talents ProgramBundesministerium für Bildung und ForschungMinisterstvo Školství, Mládeže a TělovýchovyKorea Institute of Science and TechnologyUnited States-Israel Binational Science FoundationGeneralitat ValencianaNational Research FoundationAustrian Science FundCAS Center for Excellence in Particle PhysicsChinese Academy of SciencesU.S. Department of EnergyNational Natural Science Foundation of ChinaAlexander von Humboldt-StiftungCompute CanadaUniversity of TabukNational Science FoundationCanarieDeutsche ForschungsgemeinschaftTürkiye Bilimsel ve Teknolojik Araştırma KurumuCentre National de la Recherche ScientifiqueUniverzita Karlova v Praze
KeywordsPhysicsParticle physicsBranching (polymer chemistry)Branching fractionLuminosityCP violationDetectorElectron–positron annihilationNuclear physicsAsymmetryElectronChemistryOpticsHadronAstrophysics
Abstract
We report on first measurements of branching fractions~($\mathcal{B}$) and CP-violating charge asymmetries~($\mathcal{A}$) in charmless $B$ decays at Belle~II. We use a sample of electron-positron collisions collected in 2019 and 2020 at the $Υ(4S)$ resonance and corresponding to $34.6$\,fb$^{-1}$ of integrated luminosity. We use simulation to determine optimized event selections. The $ΔE$ distributions of the resulting samples, restricted in $M_{\rm bc}$, are fit to determine signal yields. Signal yields are corrected for efficiencies determined from simulation and control data samples to obtain branching fractions and CP-violating asymmetries for flavour-specific channels. These are the first measurements in charmless decays reported by Belle~II. Results are compatible with known determinations and show detector performance comparable with the best Belle results offering a reliable basis to assess projections for future reach.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.001
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Bench or experimental · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.010
Threshold uncertainty score0.019
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
Opus teacher head0.127
GPT teacher head0.240
Teacher spread0.113 · how far apart the two teachers sit on this one work
Validation status
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
The models applied no category: nothing in the taxonomy fit this work.
Study designBench or experimental
Domainnot available
GenreEmpirical
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".
Quick stats
Citations1
Published2020
Admission routes1
Has abstractyes